Revert "Disable validation-test/stdlib/UnicodeLongTest.swift for watchos."
Revert "Disable validation-test/stdlib/UnicodeLongTest.swift for watchos."

This reverts commit 231fb5e054b3962975af9a2d79efb5f9e8335449.

This test was failing the last time we updated the stable branches
of LLVM/Clang so it was disabled. No one remembers what was the
problem, so try reenabling it to see if anything breaks.

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